Theresa said after he said that she kept him inside in fear that he was going to be hit by a car.

The little boy's death has sparked anger and resolve to change the crime wave in Oakland.

Sources told NBC Bay Area that police have two people in custody in the case.

Officially, Oakland police spokeswoman Cynthia Perkins would only say that investigators were interviewing suspected gang members about the shooting. Perkins said the investigation led to an arrest on Tuesday but that police don't think that person was connected to Monday's shooting.

"This investigation is ongoing and rapidly developing; we are confident that justice will be served," Perkins said in a press release.

Police Chief Anthony Batts attended a large vigil for Carlos Tuesday night. He told the crowd that people need to start cooperating with police who are trying to solve crimes.

"It takes an animal to take the life of a 3-year-old baby on an urban street in the middle of the day," Batts said Tuesday night.

Police responded to reports of shots fired in the area of 65th Avenue and International Boulevard at 1:12 p.m. Monday.

Two adult men were also shot, but their wounds were not life threatening. They were the intended target according to police and had no relation to little Carlos.

Wells Fargo has set up an account to help the family pay for funeral costa. Anyone interested in contributing can wire money to Carlitos Nava Foundation, Wells Fargo, 3981855954.